Swaging press



K. BOHLE.

/ SWAGING PRESS.

APPLICATION man DEC. 3. 1920 wigg agg Pate Sept. 19,1922" SHEETS SHEET 1.

Fig. 4. I

K. BUHLE.

SWAGING PRESS.

APPLICATION FILED 050.3, 1920.

1 fi fi o PatentedSept. 19, 1922,

a I I 2 SHEETSSHEET 2.

Patented Sept. W, 11922..

aerate near. Beam,- or nssEn-on-rnE-nunn,

GERMANY, ASSIGNOR T0 FRIED. KRUPP TIENGESELLSCHAFT, OF ESSEN-ON-THE-BUHR, GERMANY.

SWAGING PRESS.

Application filed December 3, 1,920. Serial No. 428,115.

To all whom it may concern:

Be it known that I, KARL Bonnie, residing at Essen-on-the-Ruhr, Germany, a citizen of the German Republic have invented a certain new and useful Swaging Press, ofwhich the following is a specification.

This invention relates to a swaging press for the manufacture of sheet metal end plates flanged outwards which will allow of producing in a sin le working operation end plates of the sai kind in such wise that the flanged edge will obtain, either on its inner or else its outer face a shell surface which will possess practically speaking, an accurately rectilinear axial section.

Two embodiments of the subject matter of this invention are shown by way of example in the accompanying drawing, in which Figs. 1 to 3 are axial longitudinal sections of the essential parts of a swaging press of the customary kind,

Figs. 4 to 6 similar views of an improved swagin press subject to this invention,

Fig. a like view of a modified form of construction. ,4

In presses serving for the production of end plates flanged outwards, the sheet A (Fig. 1) which has been cut as required and may be heated to a red heat, is, as known, placed on the die B of the swaging press and forced down into said die by the action of the stamp 0, whereby the flanged edge is formed. In the course of this operation the shell thiclmess of the said edge is increased from the bottom upwards towards its unsupported end; the increase in the shell thickness corresponding to the reduction which every diameter of a circle described on the edge concentrically to the longitudinal axis of the press before'flanging, will be subject to during the swaging operation. For this reason, the width of the radial clearance'intermediate stamp and die has, in the case of previous press structures, not been made to correspond to the original thickness 1 of 'the plate, but has been so selected asto be equal to at least the maximum thickness of plate f occurring at the unsupported end of the flanged edge; By these means the possibility, is obviated of the sheet, at the unsupported end of the flanged edge, being pressed to ther again to its former thickness, whe e y the further progfm'provement in a dimensioned 1n the manner indicated, then,

on the stamp being lowered, the sheet is rimarily bulged in in the manner disclosed in Fig. 2. During the further course of the pressing operation, the sheet tends to retain this bulged shape, the result being that on the conclusion of the pressing operation, there will arise, as Fig. 3 shows, a clearance intermediate the flanged edgewhich ,fills the radial clearance only at its unsupported endand the shell surfaces of the two swaging tools, i. e. stamp and die. Hence, the flanged edge will neither obtain a cylindrical shape on its inner nor its outer face. Since, however, in the case of end plates of this kind which are to be employed, say, as boiler ends, at least one of the shell surfaces appertaining to the outer flanged portion must be a cylindrical surface, it will consequentl become necessary to shape one of said she 1 surfaces accordingly by means of an additional working operation.

It is the. special feature of the swag'ing press in accordance with this invention by very simple means to obviate the necessity of carrying out this second, additional workmg operation.

n the form of execution shown in Figs. 4 to 6 that particular'part of the stamp of the swaging press which is intended to be applied to the flanged edge comprises a cylindrical steel ring D so slotted in an oblique direction that the surfaces of separation d and d of the ring will, when not subject to any load spring apart for a certain distance a (Fig. 4:). Again, that portion of the die destined, to be brought in contact with the flanged edge consists of a rigid ring E. Thedimensions of the two memhere D and E of the swaging press are so chosen, that the radius of thering D of the empty stamp will be smaller for the extent of the plate thickness of the work F than the radius of/the .ing E of the die.

On the stamp being depressed, the work F' is primarilyd bulged in in the manner shown in Fig. 2. In the further course of the pressing operation, the slotted ring D isnow pressed together owing to the increase of the plate thickness of the edge about to be flanged. At the same time, every section .of the flanging edge coming in contact with the ring D 'is forced against the internal surface of t e ring E of the die (Fi 5 by reason of the spring action exerte by the compressed rin D. This willresult in the outer shell sur ace of the flanged edge obtaining a cylindrical shape, Without any subsequent machinin being required. The force with which t e flanged edge is pressed against the shell surface o'f'the ring E of the die may even be increased b makin the clearance between the rings and E srimewhat smaller than the thickness of the ate. The second form of execution disclosed diagrammatically in Fig. 7, likewise relatesa.

' to a swaging press for the manufacture of sheet metal and plates, in the case of which it is intended that the internal shell surface of the flanged outer edge shall obtain a cylindrical form. In this case again that portion of the stamp destined to be brought 1n contact with the flangein making comprises a rigid ring M, and the correspondin 'portion of the die of an obliquely slottog ring Nof steel the surfaces of separation n and n of which, the ring being subject to no load, bear against each other.

The manner of operation differs from that of the form of construction shown in Figs. 4 to 6 only insofar as the slotted ring N of the die is bent apart by the fast of the material of the work spreading out radially in the course of the pressing operation; it therefore calls for no further explanation.

, However, also in this case, there may be provided special auxiliary sprin pose of enhancing the elasticlty of the slotjted ring N.

for the pur- Claims I 1. A flanging press for the manufacture of sheet metal plates flanged on their outer rim comprising a die having an annular flanging portion and a stamp having a flanging portion adapted to enter said flanging portion of the die in axial direction, one of said flan 'ng portions being rigid and the other be ng adapted to elastically yield transversely to sa1d axial direction round its whole circumference in the sense of increasing the clearance left between it and the other flanging portion.

2. A flanging press for the manufacture of sheet metal plates flanged, on their outer rim comprising a die having an annular flanging, portion and a stamp having a flanging portion adapted to enter said flanging portion of the die in axial direction, one of said flan ing portions being rigid and the other bemg a slotted ring adapted to elastically yield in the sense of. increasing the clearance left between it and the' other flanging portion.

flangingjpress for the manufacture The foregoing specification s1 KARL BGHLE. In presence of- HANS GOTTSMANN, J 0mm: Dnnoxnns.

gned at Essen, Germany, this 23rd day of July, '1920. 

